Monthly Archives: January 2011

Nice list of R programming books

There is a lot of information and resources on R. Much can be found online, through the R help mailing list, online tutorials (see e.g. Quick-R) and of course the R website. There are also numerous blogs. For a start … Continue reading

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R – using string as input in a function

I have a table with sample points from which I need to take subsets based on occurrence of these sample points in certain vegetation types. I have to repeat this many times for different combinations of vegetation types, so I … Continue reading

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Should you georeference your scientific data?

As Jeff Thurston writes in his blog, a strong case can be made for spatially enabling scientific research. This is especially true for biological / ecological research as biological processes occur across different scales. It certainly would make it that … Continue reading

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Major conservation biology textbook now free online

Conservation Biology for All, a book edited by Navjot S. Sodhi of the National University of Singapore and Paul R. Ehrlich of Stanford University, has been posted on mongabay.com, an environmental science and conservation news site. Go here to download … Continue reading

Posted in Data sources, vegetation | Tagged , | 1 Comment

Try out range of geospatial tools the easy way

The main reason I started to use Linux was because at the time it was, and still is I think, much easier and more reliable to run GRASS GIS and other FOSS geospatial tools on Linux. An exception to that … Continue reading

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Mapping Forest resource assessment 2010 data – part II

I am creating a series of maps based on the Global forest resources assessment 2010 (FRA). A first example is the map below with the forest and woodland cover per country as percentage of the total land area. The pie … Continue reading

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Finding and removing carriage returns in your SQLite table

The problem with copy data from e.g., an excel or calc sheet into an SQLite database (or any database I reckon) is that the data you copy might include an carriage return. I found this out the hard way after … Continue reading

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Mapping Forest resource assessment 2010 data – part I

About a year ago I wrote a post about how to make a map showing deforestation rates in Africa based on the Global Forest Assessment 2005 by the Food and Agriculture Organization of the United Nation (FAO). The main purpose … Continue reading

Posted in Data handling, Data sources, forest, GIS, GIS software, GRASS GIS | Tagged , , , , , , , , | 1 Comment

Getting action into your layer

QGIS provides the option to perform an action based on the attributes of a feature. This is useful if you want to run an external application or view a web page based on one or more values in your vector … Continue reading

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Creating high resolution geo-referenced maps

Just making a note to myself for when I want to make a high resolution geo-referenced map composed of different input data layers. As described here, one can save an image of the current map(s) in QGIS, but the image … Continue reading

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